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                经典游戏                </h1>
                <p>时间限制：10s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：128MB</p>			</div>
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                                <h3>题目描述</h3><p><div>&nbsp;SUPER M是一个很经典的游戏</div>
<div>&nbsp;现在改一下规则</div>
<div>&nbsp;有<span>N个城堡（0到n-1）</span></div>
<div>&nbsp;每个城堡都有一个<span>KOOPA，注意：有些KOOPA会可能有1个FATHER-KOOPA</span></div>
<div>&nbsp;公主在最后一个城堡内（<span>N-1）</span></div>
<div>&nbsp;现在每次只能打一个城堡且必须在<span>T[I]时间内打完（否则游戏结束）</span></div>
<div>&nbsp;如果（<span>N-1）号城堡打完</span></div>
<div>&nbsp;游戏结束</div>
<div>&nbsp;如果一个<span>KOOPA至少有2个SON-KOOPA被打败</span></div>
<div>&nbsp;则必须马上去击败这个<span>KOOPA否则会因为愤怒而做掉公主</span></div>
<div>&nbsp;现在求</div>
<div>&nbsp;最长游戏时间</div>
<div>&nbsp;</div></p><hr/><h3>输入格式</h3><p><div>若干组数据（<span>&lt;=10） </span></div>
<div>每组开始一个数<span>N</span></div>
<div>第二行<span>N个数表示T[I](&lt;=100)</span></div>
<div>第三行<span>N个数表示FATHER-KOOPA所在城堡编号（-1表示无FATHER-KOOPA）（最后一个数一定为-1）</span></div>
<div>数据以<span>0结尾</span></div>
<div>&nbsp;</div></p><hr/><h3>输出格式</h3><p><div>&nbsp;</div>
<div>对于每组数据输出一个数，即最大游戏时间</div>
<div>&nbsp;</div></p><hr/><h3>样例输入</h3><pre>
5 
1 2 3 4 5
4 4 4 4 -1
5
2 2 2 2 2
1 2 3 4 -1
0
 
</pre><hr/><h3>样例输出</h3><pre>
12
10
 
</pre><hr/><h3>提示</h3><p><p>对于100%的数据 n&lt;=100000</p></p><hr/><h3>题目来源</h3><p>没有写明来源</p>
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